/Engine/Source/Runtime/Engine/Classes/Kismet/KismetMathLibrary.h
Gets a normalized unit copy of the 2D components of the vector, ensuring it is safe to do so. Z is set to zero. Returns zero vector if vector length is too small to normalize.
Normalized copy if safe, (0,0,0) otherwise.
static FVector Vector_Normal2D ( FVector A, float Tolerance )